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This animal provides physical evidence that the jaws of the animals from the north and the animals from the south were different
這些動物提供了自然證據，北半球動物的顎骨與南半球動物是不一樣的
at this time and it provides probably the only clue that we have for this in South America.
這一次提供的或許是我們在南美洲找到的唯一線索
This is a unique specimen. It's fantastic.
這是唯一的標本。太奇妙了。
As the super-continent split, the jaw showed that mammals in the southern continent
正如顎骨顯示的結果，隨著超大陸的分裂，南方大陸的哺乳動物
were evolving separately from those in the Northern Hemisphere.
與北半球的哺乳動物開始分道揚鑣
This was evidence that vicariance was beginning in the mid-Jurassic, at least for mammals,
這就是地理分隔開始于中侏羅世的證據，至少哺乳類是如此
but was there proof of vicariance in the dinosaurs?
那么是否也有關于恐龍地理分隔的證據呢
To find out they needed fossils from different times in the mid-Jurassic.
為此，他們必須找到中侏羅世各個時期的化石
We need dinosaurs from just before the break up of the continent
我們需要大陸分裂前的恐龍化石
and just after the break up of the continent and that is what we have here.
和大陸分裂后的恐龍化石，我們在這兒找的就是這些
So they carefully dug out the fossils
于是他們小心地挖出化石
and encased them in plaster to protect them on the long journey back to the lab.
用石膏包住它們，以免在運回實驗室的長途中受到損壞
Only then could the analysis begin.
之后，他們才開始分析研究。
